Originally Posted by foreigneRS
YBP
so what you're saying is to go to a bigger turbo with less back pressure from the exhaust housing/turbine, and then use a 'wilder' cam with more overlap and duration than is normally considered. that will up the volumetric efficiency of the engine considerably and allow the turbo to boost up nice and early?
i've been to your fine country to a gatebil meet at rudskogen, and couldn't believe the size of turbo's that you guys run, and how quickly they spin up
by the way, why have you done away with the coil on plug system from your ybp engine and replaced with a coil pack type? better reliability due to heat?
Yes, but not just bigger. Those stoneage-technology T4 turbos just donīt cut it anymore. Iīm running a Precision turbo which has garrett GT tech wheels capable of more hp than the rs500 T4 but with full boost atleast 1000rpm lower down.
The VE will probably be lower at very low rpm, but on high power engines you donīt mess around below 2000rpm anyways if you want something to happen ( that beeing said, my engineīs got more than enough driveability low down, just not very powerful and torqy sub 2k rpm. )so from below 3k the VE would be good even with "wild" cams, and the turbo should spool up good.
The Electromotive TecII has coils built in that is VERY powerful, but with another managent system I would probably have used the original system. The coilpack you see is actually the ECU with the coils on top.
I donīt doubt people have had bad experiences with too wild cams, but generally people are beeing too cautious(?) I mean whats the use of a big turbocharger that will provide good boost with high efficiency from 4k to 7k+ paired with a cam that is efficient sub 6k?